I think the FP seating for Nemo is probably better than the FP seating for FotLK, in comparison to non-FP seating. There's really not a bad seat in FothK due to the style of the theater there. But I think the PP who suggested FotLK for being picked for participation has a point.
If OP asked about getting a FP for a show or a ride, I'd definitely say a ride! You don't really need them for the shows, like I said. But I'm assuming OP has an "extra" FP to use for a show. If you can't do intense rides, there's not a lot of ride options.